*{
    margin: 0;
    padding: 0;
}
ol,ul{
    list-style-type: none;
}
body{
    margin:0 auto;
}
a{
    text-decoration: none;
    color: rgb(0, 140, 186);
}
#first-top .exit a{
    color: rgb(246,246,246);
}
#first-left a:hover{
    color: rgb(246,246,246);
    background-color: rgb(0, 140, 186);
}
.left{
    float: left;
}
.right{
    float: right;
}
#first-top{
    height: 45px;
    margin-right: 0px;
    background-color: rgb(51, 51, 51);
    box-shadow: 0 2px 2px rgb(51, 51, 51);
}
#first-top .exam img{
    width: 73px;
    height: 39px;
}
#first-top .exit{
    margin-right: 20px;
    margin-top: 11px;
}
#first-left{
    margin-top: 2px;
    background-color: rgb(246,246,246);
    width: 11%;
    height: 619px;
    float: left;
    box-shadow: 2px 0 2px rgb(51, 51, 51);
}
#first-left .nav{
    width: 75%;
    height: 20px;
    margin: 5px 20px;
}
#first-left ul li{
    height: 40px;
    vertical-align: middle;
    text-align: center;
    margin: 1px auto;
    line-height: 40px;
    border: 1px solid rgb(246,246,246);
}
#first-left .current {
    background-color: rgb(51, 51, 51);
    color: rgb(246,246,246);
}
#first-right{
    float: left;
    width: 89%;
    height: 619px;
}
#first-right .item img{
    display: inline-block;
    width: 100%;
    height: 622px;
}
#first-right .item {
    display: none;
}
#first-buttom {
    background-color:rgb(51, 51, 51);
    height: 55px;
    position: absolute;
    width: 100%;
    top: 667px;
}